If the name is defined as a PK I think you shouldn't have any problem... On Tue, 2003-07-29 at 03:46, Jean-philippe VIGNIEL wrote: > What appens if two persons create the same object at the same time. With > the default transaction mode, i think (but i can be wrong) that the > object can be created twice. > > By example; > > User1: select * from object where name="bob"->nothing so it's ok > User2: select * from object where name="bob"->nothing so it's ok > User1: create "bob" > User2: create "bob" > User1: close transaction > User2: Close transaction > > And there are two bob objects within the database. > > > Before EJB tomanage this case we did a select for update. Perhaps it's > possible to set the transaction mode to serialized for the create method??? > > Thanks for your advice about with subject? > >
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